22 THE POPULAR SCIENCE MONTHLY 



should be given to this one. The plan which this committee hopes to 

 carry out involves a constant watch of the comet, to be undertaken by a 

 series of observers, so situated in latitude and longitude that the comet 

 will never be lost sight of, except, of course, when it is in conjunction 

 with the sun. A continuous series of photographs, taken in this way, on 

 practically a uniform plan, will go far, it is hoped, toward the solution 

 of some of the puzzling questions in connection with the physical be- 

 havior of these bodies, particularly with the rapid and peculiar change 

 of the tail. The committee reports that good progress is being made 

 towards carrying out their program. For the purpose of bridging the 

 long interval between the Pacific coast and eastern Asia, Mr. Ellerman, 

 of the Mount Wilson Observatory, expects to go to Honolulu early 

 next spring. 



